SCR conversion efficiency diagnostics
AssigneeCummins Emission Solutions Inc.
InventorNassim Khaled
Life of this patent
Estimating the term…
Abstract
A system for determining a performance status of an exhaust aftertreatment system may include determining an ammonia-to-nitrogen ratio using a sample ammonia input value and a sample NOx input value. An actual NOx input value and an actual ammonia input value can be received. An emission value from may be received from a first sensor. A NOx emission estimate, an ammonia slip estimate, and an optimal ammonia storage value for a selective catalytic reduction may be determined using an iterative inefficiency calculation based, at least in part, on the actual NOx input value, the actual ammonia input value, and the ammonia-to-nitrogen ratio; and the NOx emission estimate, the ammonia slip estimate, and the optimal ammonia storage value may be outputted to a diagnostic system.
Claims30
A system, comprising:
- an exhaust aftertreatment system comprising a first sensor;
- and
- a controller configured to:
- determine an ammonia-to-nitrogen ratio using a sample ammonia input value and a sample NOx input value;
- receive an actual NOx input value and an actual ammonia input value;
- receive an emission value from the first sensor;
- determine a NOx emission estimate, an ammonia slip estimate, and an optimal ammonia storage value for a selective catalytic reduction using an iterative inefficiency calculation based, at least in part, on the actual NOx input value, the actual ammonia input value, and the ammonia-to-nitrogen ratio;
- and
- output the NOx emission estimate, the ammonia slip estimate, and the optimal ammonia storage value to a remote diagnostic system.
A computerized method for determining a performance status of an exhaust aftertreatment system comprising a first sensor and a controller, the method comprising:
- determining an ammonia-to-nitrogen ratio using a sample ammonia input value and a sample NOx input value;
- receiving an actual NOx input value and an actual ammonia input value;
- receiving an emission value from the first sensor;
- determining a NOx emission estimate, an ammonia slip estimate, and an optimal ammonia storage value for a selective catalytic reduction using an iterative inefficiency calculation based, at least in part, on the actual NOx input value, the actual ammonia input value, and the ammonia-to-nitrogen ratio;
- and
- outputting the NOx emission estimate, the ammonia slip estimate, and the optimal ammonia storage value to a remote diagnostic system.
A non-transitory computer-readable medium with computer-readable instructions thereon that, when executed by a controller associated with an exhaust aftertreatment system, cause the controller to:
- determine an ammonia-to-nitrogen ratio using a sample ammonia input value and a sample NOx input value;
- receive an actual NOx input value and an actual ammonia input value;
- receive an emission value from a first sensor;
- determine a NOx emission estimate, an ammonia slip estimate, and an optimal ammonia storage value for a selective catalytic reduction using an iterative inefficiency calculation based, at least in part, on the actual NOx input value, the actual ammonia input value, and the ammonia-to-nitrogen ratio;
- and
- output the NOx emission estimate, the ammonia slip estimate, and the optimal ammonia storage value to a remote diagnostic system.
Dependencies are inferred from the claim text.